On March 9, 2018, the U.S. International Trade Commission (USITC) issued an announcement stating that the anti-dumping and anti-subsidy industrial damages imported from China's Cast Iron Soil Pipe had a definitive preliminary ruling on the import of the products involved in the case. The domestic industry in the United States constitutes substantial damage. In this ruling, four members of the International Trade Commission voted for a positive vote. The US Department of Commerce will continue to investigate anti-dumping and anti-subsidy investigations of the products involved in the case, and it is expected that the preliminary countervailing duty on the case will be made on April 23, 2018 and the initial anti-dumping decision will be made on July 5, 2018.

On February 16, 2018, at the request of the Cast Iron Soil Pipe Institute submitted on January 26, 2018, the U.S. Department of Commerce announced the initiation of anti-dumping and anti-subsidy filing of imported iron sewer pipes from China. survey. This case involved the United States coordinating products under the tariff number 7303.00.0030.